Punching and shearing machine.



No. 855,765. PATENTED JUNE 4, 1907.

R. GBRLAOH.

PUNGHING AND SHEARING MACHINE.

APPLICATION FILED JUNE 24, 1905.

UNITED STATES PATENT orrion.

ROBERT GERLAOH, OF BUFFALO, NEW YORK, ASSIGNOR TO BUFFALO FORGE COMPANY,OF BUFFALO, NEW YORK.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed June 24, 1905. Serial No. 266,726.

To aZZ whom it may concern:

Be it known that I, ROBERT GERLAOH, a citizen of the United States,residing at Buf-. falo, in the county of Erie and State of New York,have invented a new and useful Improvement in Punching and ShearingMachines, of which the following is a specification.

This invention relates to metal punching and shearing machines moreparticularly of the portable and hand actuated types employed forblacksmith and general shop work.

The object of the invention is to produce a machine of the characterdescribed of inexpensive and exceedingly simple construction, whichinvolves the minimum number of parts arranged to the best advanta e soas to produce a very strong and powerfu machine which is lighter andmore compact than known machines of equal capacity.

In the accompanying drawings: Figure 1 is a perspective view of acombined punching and shearing machine embodying the invention. Fig. 2-is a fragmentary section thereof, on an enlarged scale, substantially inline 22, Fig. 1. Fig. 3 is a fragmentary 'perspective view of a combinedpunching and shearing machine of modified construction.

Like letters of reference refer to like parts in the several figures.

A represents a standard upon which all of the working parts of themachine are mounted. This standard consists of a single flatsided steelor wrought metal plate, such as armor or boiler plate, and is mounted onand held in upright position by a suitable base B. The machine shown inFig. 1 is of the portable kind and the base B is provided with truckwheels I) which enable the machine to be rolled about from place toplace. The improvements are not, however, confined to a portable machineand the standard may be mounted on any other suitable base or suport. pC represents a reciprocating punch head or slide in which the punch c isremovably secured in any usual or preferred manner enabling the readyinterchange of punches of different sizes. The punch slide is guided andconfined in a holein a guide block 0 which is preferably slotted toembrace the plate standard to which it is bolted or otherwise rigidlysecured above an opening D provided in the standard to enable the workto be placed beneath the punch.

E represents the bed block or die holder which rests on the standard atthe lower side of the work opening and is slotted at its bottom tostraddle the standard to which it is bolted or otherwise rigidlysecured. The die holder is provided in its upper portion with alongitudinal channel or seat for the usual die F which is preferablyprovided with a series of punch holes of different diameters and isadjustably securedin proper relation to the punch by set screws fpassing through the die holder and engaging the die. As the die holderbears on the lower edge of the work openin in the standard its securingbolts are relieved from the strain, which would otherwise fall uponthem. The front edges of the die holder and standard are cut away at gbeneath the die to permit the escape of the slugs punched from the work.

The punch is operated by suitable lever mechanism, which in theconstruction shown in Figs. 1 and 2 is arranged as follows: H

represents a punch lever consisting of two fiat steel bars located onopposite sides of the plate standard and fulcrumed to the latter by apivot or pin it passing through the lever bars and standard above thepunch slide. The punch lever is connected to the punch slide by twolinks h pivoted to the punch slide and lever. The pivot pin k connectingthe links and punch lever passes through and works in a slot k in thestandard indicated by dotted lines, Fig. 1. The long arm of the punchlever is connected by links 0'. with a hand lever I. The hand levershown has a forked inner end straddling and fulcrumed to the standardand two sockets i for the usual removable handle, not shown. The flatcentral steel plate standard is thick enough to give the necessarybearing for the lever fulcrums and yet as the plate is flat and verymuch thinner than a cast standard of like strength, the bars of thelever can be arranged directly against the faces of the plate standardand close together. This enables the use of a short fulcrum and alsoallows the links connecting the lever and punch slide to be locatedclose beside the punch slide without increasing the width of the latter.The pivot pin connecting the links to the punch LOO slide is thus alsoshortened and much less liable to bend than a longer pin connectinglinks spaced farther apart.

The machine thus far described could be used as a punch alone butpreferably a shearing tool is combined with the punch in the onemachine. In the construction shown in Fig. 1 the shears are arrangedabove the punch at the same side of the standard, but the relativearrangement of the punch and shears may be different.

K represents a stationaryshearing blade which is rigidly bolted to oneface of the standard above a work opening is therein. The blade is setin a rabbet in the standard to provide an abutting shoulder k" for theblade to relieve the securing bolts from shear.

The movable shear blade K is carried by a lever or jaw consisting of twobars L at opposite sides of the standard and fulcrumed thereto by a pinor bolt Z. The movable blade K and a spacing block Z are bolted betweenthe bars of the lever and rest on shoulders Z provided on the insides ofthe j aw bars to relieve the securing bolt. The movable blade K is alsopreferably provided with a shoulder Z which bears on top of the spacingblock to better hold the blade. The lever or jaw L is operated by thepunch. lever, to which it is connected, as by links m pivoted to the twolevers.

N, Fig. 2, represents a work rest which is secured to that side of thestandard on which the stationary shear blade is located to hold the workfrom tilting under the action of the shear blades.

The advantages of the central plate standard above pointed out inconnection with the punch apply with equal force to the shears, whetheremployed alone or in a combined. punching and shearing machine.

The punching and shearing tools can be combined in other relations in amachine having the central plate standard such as described. Forinstance, Fig. 3 illustrates a machine in which a punch O is arranged atone edge of a plate standard P and a pair of shears Q at the oppositeedge of the standard. In this machine the punch and movable shear bladeare connected to punch and shear levers p and g which are connected byindependent links 29 g, respectively, to a hand lever R. The punch andshear levers, in this construction, as in that previously described,each consists of two bars arranged against the opposite sides of theflat plate standard, enabling a similar advantageous arrangement of thefulcrums, pivots and connecting links.

A punching or shearing, or combined punching and shearing machineconstructed as described with the central steel plate standard is adecided improvement over the 31d style machines having cast metal framesor standards, because the tensile strength of the steel plate is greaterthan a casting of much greater thickness and it enables a much morecompact arrangement of the levers, links and pivots with the statedbeneficial results. In fact it has been necessary in cast iron machinesof less capacity to use two or three heavy frame castings each of muchgreater thickness than that of the single central steel plate, therebynot only greatly increasing the bulk and weight of the machine but alsogreatly adding to the cost of manufacture in properly matching andmachining the various parts. The central plate is also more desirablethan two spaced frame plates of less thickness than the central platearranged on opposite sides of the working parts of the machine, for itis necessary to provide the thin plates with separately secured boxes toafford the necessary bearing area for the lever pivots, and these boxesmust be applied with care requiring considerable labor and areconstantly working loose and breaking.

The machine is described in this application as provided with punchingand shearing tools only. It will be manifest, however, that the sameconstruction would be useful for machines provided with other sorts oftools for working metal, and it is not desired to limit the invention topunching and shearing machines only.

I claim as my invention:

1. In a machine of the nature described, the combination of a flat-facedplate stand.- ard, a lever consisting of connected plates or barsarranged at opposite sides of said plate standard and fulcrumed thereto,and a tool comprising a stationary member secured on said plate standardsubstantially in the plane thereof, and a co-operating movable memberarranged. in a plane between said lever plates and operatively connectedthereto, substantially as set forth.

2. In a machine of the nature described, the combination of a platestandard having opposite flat faces, a jaw consisting of two connectedbars arranged against the opposite flat faces of said plate standard andmovably supported thereon, a stationary cutting member mounted on saidstandard substantially in the plane thereof, and a movable co-operatingcutting member arranged between and secured to the bars of said jaw,substantially as set forth.

3. In a'machine of the nature described, the combination of a platestandard having opposite flat faces and provided with an opening, amovable jaw consisting of two connected bars arranged at opposite sidesof said standard'at one side of said opening, a stationary shear blademounted on said standard at the opposite side of said opening, and amovable shear blade arranged in said opening between-and secured to thebars of said jaw, and means for operating said jaw, substantially as setforth.

4. In a machine of the nature described, the combination of a platestandard, a lever consisting of bars arranged against the 0pposite facesof said plate standard and fulcrumed thereto, a stationary shear bladesecured to said plate standard, a jaW consisting of bars arrangedagainst the opposite faces of said plate standard and movably connectedthereto, a movable shear blade secured be tween said bars of the j aw,and means connecting the jaw and said other lever, substantially as setforth.

5. In a machine of the nature described, the combination of a platestandard, a lever consisting of bars arranged against the opposite facesof said plate standard and fulcrumed thereto, a punch die mounted onsaid plate standard, a punch slide connected to said lever, a stationaryshear blade secured to said plate standard, a movable shear blade, a jaWcarrying said movable shear blade and consisting of bars arrangedagainst the opposite faces of said plate standard and fulcrumed thereto,and operating meansfor said punch lever and shears jaw, substantially asset forth.

Witness my hand this 15th day of May,

ROBT. GERLAOH. l/Vitnesses WM. L. Fox, E. J. COLEMAN.

